<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{
            padding: 0;
            margin: 0;
        }
        html,body{
            width:100%;
            height: 100%;
            /* 让容器宽高充满全屏 */
        }
        body{
            background-color: pink;
            display: flex;
            flex-direction: row;
            align-items: center;
            justify-content: center;
        }
        .heart{
            width: 200px;
            height: 200px;
            background-color: red;
            position: relative;
            transform: rotate(45deg);
            animation: heartbit 1.5s alternate infinite;
            box-shadow: 0 0 20px red;
        }
        .heart::before{
            content:"";
            width:200px;
            height: 100px;
            background-color: red;
            position: absolute;
            top:-99px;
            left:0px;
            border-radius: 100px 100px 0 0;
            box-shadow: 0 0 20px red;
        }
        .heart::after{
            content:"";
            width:100px;
            height: 200px;
            background-color: red;
            position: absolute;
            top:0px;
            left:-99px;
            border-radius: 100px 0 0 100px;
            box-shadow: 0 0 20px red;
        }

        /* 实现动画，让心跳动起来 */
        @keyframes heartbit {
            0%{
                transform: rotate(45deg) scale(0.6);
            }
            /* 25%{
                transform: rotate(45deg) scale(0.8);
            }
            50%{
                transform: rotate(45deg) scale(1);
            }
            75%{
                transform: rotate(45deg) scale(1.2);
            } */
            100%{
                transform: rotate(45deg) scale(1.4);
            }

            
        }
    </style>
</head>
<body>
    <div class="heart">

    </div>
</body>
</html>